title: [To the differential diagnosis of arthritis of pseudotuberculous and chlamydial etiology].
abstract: OBJECTIVE
  to define main differential diagnostic criteria for arthritides of chlamydial and pseudotuberculous etiology and to improve patient examination tactics.
  
  
  METHODS
  Forty-six patients with pseudotuberculosis and 41 patients with chronic urogenital chlamydial infection with articular involvement were examined. A bacteriological method of polymerase chain reaction (PCR), agglutination test, enzyme immunoassay (EIA) (IgA, IgG, IgM), indirect hemagglutination (IHA) test were used to diagnose pseudotuberculosis. Diagnostic techniques for chlamydiasis involved cultural, direct immunofluorescence (DIF), real-time PCR, and EIA (IgM, IgG, IgA).
  
  
  RESULTS
  Patients with pseudotuberculosis developed polyarthritis and oligoarthritis in 56 and 39%, respectively. The development of arthritides was accompanied by fever in 89%, exanthema in 57%, gastrointestinal lesion in 56%, hepatomegalia in 78%. The pseudotuberculous etiology of the disease was confirmed by the agglutination test in 71% of the patients and by IHA in 7%. EIA revealed IgG in 78% of the patients, IgA in 11%, and IgM in 29%. PCR of synovial fluid (SF), synovial shell, and other biological substrates revealed Yersinia pseudotuberculosis DNA in 43%. Chlamydiasis and polyarthritis developed in 71 and 19%, respectively. The diagnosis of chlamydiasis was verified by EIA detection of IgG and IgA in 76 and 27% of cases, respectively. DIF, PCR, and culture studies of urethral scrapes found Chlamydia in 9, 32, and 29% of cases, respectively. Examination of SF and synovial shells revealed Chlamydia trachomatis in 24% of the patients and culture studies detected the pathogen in 21%.
  
  
  CONCLUSIONS
  Asymmetrical polyarthritides mainly involving the knee joints are the most common arthritides of pseudotuberculous etiology. EIA detection of serum IgG and IgA and PCR study of SF are optimal diagnostic tools. Artritides of chlamydial etiology are asymmetrical oligoarthritides predominantly involving the knee and ankle joints. Examination of urethral and cervical canal scrapes, SF by culture and PCR studies and that of serum IgA and IgG by EIA are optimal diagnostic tests.
authors.forename: O A
authors.initials: OA
authors.lastname: Burgasova
authors.forename: N D
authors.initials: ND
authors.lastname: Iushchuk
authors.forename: L V
authors.initials: LV
authors.lastname: Pogorel'skaia
authors.forename: G Ia
authors.initials: GIa
authors.lastname: Tseneva
authors.forename: L B
authors.initials: LB
authors.lastname: Kuliashova
authors.forename: E A
authors.initials: EA
authors.lastname: Voskresenskaia
authors.forename: I P
authors.initials: IP
authors.lastname: Feduniak
mesh_terms: D000328:Adult; D000907:Antibodies, Bacterial / Q000032:analysis; D001170:Arthritis, Infectious / Q000175:diagnosis* / Q000209:etiology / Q000382:microbiology; D015415:Biomarkers / Q000032:analysis; D002690:Chlamydia Infections / Q000150:complications* / Q000382:microbiology; D002908:Chronic Disease; D003937:Diagnosis, Differential; D005260:Female; D052776:Female Urogenital Diseases / Q000150:complications* / Q000382:microbiology; D006801:Humans; D008297:Male; D052801:Male Urogenital Diseases / Q000150:complications* / Q000382:microbiology; D015012:Yersinia pseudotuberculosis Infections / Q000150:complications* / Q000382:microbiology
chemical_list: D000907:Antibodies, Bacterial; D015415:Biomarkers